I’ve had this belly button idea for years – where you tickle a picture of a baby and it giggles out loud. First it was going to be a book with a sound chip. Too complicated. Then apps appeared and voilà! It’s a perfect format. So after umpteen months of wrestling with animation and app code, we’ve just launched our new app: The Button Book.

The app features 10 animated photos of different babies, with 30 different laugh-overs. Tap or tickle the babies’ belly buttons and they come alive, erupting into delicious laughter. It’s a devastatingly effective way to turn your grouchy toddler into the happy dreamchild you always knew they could be.